deuther



(No Model.)

L. A. DEUTHER.

RACK POR PICTURE AND OTHER FRAMES.

No. 270,563. Patented Ja.11.9,x1883.

L NITED STATES PATENT OEEIcE.

LORENZ A. DEUTHEB, OF BUFFALO, NEW YORK.'

BAoK FOR PICTURE AND OTHER FRAMES.

SPECIFICATION forming part of Letters Patent No. 270,563, dated January 9, 1 883. Application filed November 15, 1882. (No model.)

To all whom it may concern Be it known that l, LORENZ A. DEUTHER, of the city of Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Backs for Picture and other Frames, of which the following is a specification.

This invention relates to a novel construction of a back for picture-frames, mirrors, and other like articles; and the object ot' the invention is to produce a strong, light, and durable back, which is not liable to bulge, warp, or crack while in use, and which can be produced at comparatively small expense.

My invention consists of the peculiar construction ofthe back, which will be hereinafter` fully set forth, and pointed out in the claims.

In the accompanying drawings, Figure l is a perspective view of my improved back. Figs. 2 and 3 are perspective Views representing modilied constructions ofthe back.

Like letters of reference refer to like parts in the several figures.

The body of the back or plate is composed of a number of thin blocks, A, made of wood, pasteboard, or similar rigid material, and placed side by side. The blocks A are secured between two sheets of paper, B, which are firmly glued or cemented to the blocks.

1n constructing my improved back plate, a number of blocks A sufficient to form a back plate of the desired size are placed upon a table or other fiat surface side by side, so as to be in contact with each other at their edges. A sheet of paper B of sufficient size to cover the series of blocks A on one side is then covered with glue or other liquid cement, whereby the paper is expanded. The sheet ot' paper so prepared is then placed with the side to which the glue or cement has been applied upon the blocks A, and rmly secured thereto. The blocks, with the sheet of paper adhering to their upper sides, are then turned over and another sheet of paper B, similarly covered with glue or cement and expanded, is then secured to the exposed sides of the blocks A. The sheets of paper B contract in drying and draw the blocks lirmly against each other, thereby producing a rigid plate of sufficienti: strength for the purpose for which it is intended. As the blocks A are secured between two sheets of paper, the compressive strains on both sides of the blocks are alike, and the warping of the plate is thereby prevented.

When the plate has become sufficiently dry it is preferably coated with a'suitable varnish or paint, which excludes moisture and further guards against warping or bulging of the plate.

l prefer to use square blocks in making up the plate 5. but triangular blocks lnay be used, as represented in Fig. 3, or any otherpolygonal forms may be employed, regular or irregular, which permit the blocks to come in contact with each other at their edges. I prefer to arrange the blocks so that the grain in one row of blocks runs at right angles to the. grain in the two adjacent rows.

It preferred, the plate may be composed ot' small and large blocks, as represented in Fig. 2,'whereby the joints between the several rows ot' small blocks are broken, so as not to extend from end to end ot' the plate, whereby the strength and durability ofthe plate is considerably increased.

The blocks of uniform size (represented in Fig. l) may also be arranged so as to break joints, if desired.

The table or surface upon which the plates are made up is preferably provided with two gage-strips arranged at right angles to each other for convenience in arranging the blocks thereon.

The blocks of which the body of the plate is composed are readilysawed out of scraps or odd pieces of material which have no particular value, and the cost of the plate is thereby considerably reduced. l

I claim as my iuventionf 1. A back plate for the frames of pictures, mirrors, &c., composed of fiat blocks A, constructed of wood or other rigid material, and arranged with their edges in contact with each other, and two sheets or strips ot' paper, B, glued or cemented to opposite sides of the blocks A, the whole forming a light,iniiexible plate of uniform thickness, substantially as set forth. A

2. A back plate for the frames of pictures, mirrors, Sac., composed of dat blocks A, made of different sizes, whereby the joints between the-blocks are broken and two sheets of paper B glued or cemented to opposite sides of the blocks A, substantially as set forth.

' LORENZ A. DE UTEIER.

YVitnesses:

JNO. J. BoNNER, OrIAs. F. GEYER.

ICO 

